dsh-file-path: Drag Non-Image Files as Path References

`dsh-file-path` is a DeepSeek Harness plugin that addresses the limitation of the Web composer only supporting image attachments by default. It allows users to drag PDFs, Office documents, or folders into the editor; the plugin then automatically uses the local dsh process to locate and insert the files' absolute paths as plain-text references, without uploading or writing the files. It supports multiple file types, folder dragging, and mixed drag-and-drop handling, and it takes over the default full-page drag-and-drop overlay. Users can use the plugin via a toolbar button or by directly dragging and pasting. Because it involves local code execution, a security review is necessary before installation.